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// Copyright 2018 Adam Tauber
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package colly
import (
"bytes"
"fmt"
"io/ioutil"
"mime"
"net/http"
"strings"
"github.com/saintfish/chardet"
"golang.org/x/net/html/charset"
)
// Response is the representation of a HTTP response made by a Collector
type Response struct {
// StatusCode is the status code of the Response
StatusCode int
// Body is the content of the Response
Body []byte
// Ctx is a context between a Request and a Response
Ctx *Context
// Request is the Request object of the response
Request *Request
// Headers contains the Response's HTTP headers
Headers *http.Header
}
// Save writes response body to disk
func (r *Response) Save(fileName string) error {
return ioutil.WriteFile(fileName, r.Body, 0644)
}
// FileName returns the sanitized file name parsed from "Content-Disposition"
// header or from URL
func (r *Response) FileName() string {
_, params, err := mime.ParseMediaType(r.Headers.Get("Content-Disposition"))
if fName, ok := params["filename"]; ok && err == nil {
return SanitizeFileName(fName)
}
if r.Request.URL.RawQuery != "" {
return SanitizeFileName(fmt.Sprintf("%s_%s", r.Request.URL.Path, r.Request.URL.RawQuery))
}
return SanitizeFileName(strings.TrimPrefix(r.Request.URL.Path, "/"))
}
func (r *Response) fixCharset(detectCharset bool, defaultEncoding string) error {
if defaultEncoding != "" {
tmpBody, err := encodeBytes(r.Body, "text/plain; charset="+defaultEncoding)
if err != nil {
return err
}
r.Body = tmpBody
return nil
}
contentType := strings.ToLower(r.Headers.Get("Content-Type"))
if !strings.Contains(contentType, "charset") {
if !detectCharset {
return nil
}
d := chardet.NewTextDetector()
r, err := d.DetectBest(r.Body)
if err != nil {
return err
}
contentType = "text/plain; charset=" + r.Charset
}
if strings.Contains(contentType, "utf-8") || strings.Contains(contentType, "utf8") {
return nil
}
tmpBody, err := encodeBytes(r.Body, contentType)
if err != nil {
return err
}
r.Body = tmpBody
return nil
}
func encodeBytes(b []byte, contentType string) ([]byte, error) {
r, err := charset.NewReader(bytes.NewReader(b), contentType)
if err != nil {
return nil, err
}
return ioutil.ReadAll(r)
}